Measurement of inclusive D*{plus_minus} and associated dijet cross sections in photoproduction at HERA.
Inclusive photoproduction of mesons has been measured for photon-proton centre-of-mass energies in the range GeV and photon virtuality 1 GeV. The data sample used corresponds to an integrated luminosity of 37 pb. Total and differential cross sections as functions of the transverse momentum and pseudorapidity are presented in restricted kinematical regions and the data are compared with next-to-leading order (NLO) perturbative QCD calculations using the 'massive charm' and 'massless charm' schemes. The measured cross sections are generally above the NLO calculations, in particular in the forward (proton) direction. The large data sample also allows the study of dijet production associated with charm. A significant resolved as well as a direct photon component contribute to the cross section. Leading order QCD Monte Carlo calculations indicate that the resolved contribution arises from a significant charm component in the photon. A massive charm NLO parton level calculation yields lower cross sections compared to the measured results in a kinematic region where the resolved photon contribution is significant.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- ER
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 942370
- Report Number(s):
- ANL-HEP-PR-98-97
- Journal Information:
- Eur. Phys. J., Journal Name: Eur. Phys. J. Journal Issue: 1999 Vol. C6; ISSN 1434-6044
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Diffractive dijet cross sections in photoproduction at HERA.
Measurement of Dijets with a Leading Neutron in ep Interactions at HERA
High-E{sub T} dijet photoproduction at HERA
Journal Article
·
Wed Dec 31 23:00:00 EST 1997
· Eur. Phys. J. C
·
OSTI ID:938361
Measurement of Dijets with a Leading Neutron in ep Interactions at HERA
Journal Article
·
Thu Oct 06 00:00:00 EDT 2005
· AIP Conference Proceedings
·
OSTI ID:20726485
High-E{sub T} dijet photoproduction at HERA
Journal Article
·
Mon Oct 01 00:00:00 EDT 2007
· Physical Review. D, Particles Fields
·
OSTI ID:21032312